You may have several problems.
This KB article should fix the access to the Internet problem:
http://support.microsoft.com/kb/892350
I'd strongly advise a full scan of your machine with a current antivirus.
If yours is still not responding you could try Norton's online scanner:
http://security.symantec.com
--
FAQ for Microsoft Antispyware:
http://www.geocities.com/marfer_mvp/FAQ_MSantispy.htm
"(E-Mail Removed)" <(E-Mail Removed)> wrote in
message news:1cdb01c55506$040a8450$(E-Mail Removed)...
> Please advise how to fix this problem - we need to
> unblock and access Hotmail and Google. Also Norton
> antivirus is not responding.
>
> PC is running Microsoft Windows XP Home.
>
> Thanks.